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Why "你真的只有" becomes "你真的只有"(只有 is displayed in italics). I must type a space after 你 and before 只有 in order to get bold style correctly.
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Liu YongtaiJul 3 '12 at 5:18

Hi, welcome to this site! As for your question, I've suffered it too, but the moderator Alenanno gave me a good solution-just use the html tag <Strong>words</Strong> to make the words in bold.
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HuangJul 3 '12 at 6:44

The way I've had Chinese people express surprise to me is to use 这么. For example:

你是18岁？这么年轻！看不出来！

I realize that this is different than the sentence structure that you gave (and that NS.X. helped clarify) but I find that in my interactions with Chinese, they're more apt to follow their question of disbelief with an exclamation describing their reaction in order to express their surprise.